<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <el-table :data="rolelist" border stripe>
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row :class="['bdbottom', i1 === 0? 'bdtop' : '','vcenter']" v-for="(item1, i1) in scope.row.children" :key="item1.id">
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row, item1.id)" >{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <el-col :span="19">
                <el-row :class="[i2 === 0? '':'bdtop', 'vcenter']" v-for="(item2, i2) in item1.children" :key="item2.id">
                  <el-col :span="6">
                    <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag type="warning" v-for="(item3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">
                      {{item3.authName}}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <pre>
                {{scope.row}}
            </pre>
          </template>
        </el-table-column>
        <el-table-column type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit" >编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
            <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <el-dialog title="分配权限" 
              :visible.sync="setRightDialogVisible" 
              width="50%"
              @close="setRightDialogClosed">
      <el-tree :data="rightslist" 
               :props="treeProps" 
               show-checkbox
               node-key="id"
               default-expand-all
               :default-checked-keys="defKeys"
               ref="treeRef">
      </el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取消</el-button>
        <el-button type="primary" 
                  @click="allotRights">确定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>

export default {
  data() {
    return {
      //所有角色列表数据
      rolelist: [],
      setRightDialogVisible:false,
      // 所有权限的数据
      rightslist: [],
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      defKeys:[],
      roleId: ''
    }
  },
  created() {
    this._getRoleList()
  },
  methods: {
    async _getRoleList() {
      const {data: res} = await this.$http.get('roles')

      if(res.meta.status !== 200) {
          return this.$message.error('获取角色列表失败')
      }
      this.rolelist = res.data
    },
    async removeRightById(role, rightId) {
      const confirmResult = await this.$confirm(
          '此操作将永久删除该文件，是否继续？',
          '提示',
          {
              confirmButtonText: '确定',
              cancelButtonText: '取消',
              type: 'warning'
          }
        ).catch(err => err)
        
      if(confirmResult !== 'confirm') {
        return this.$message.info('取消了删除')
      }
      console.log('确认删除')   
      const {data:res} = await this.$http.delete(`/roles/${role.id}/rights/${rightId}`)
      if(res.meta.status !==200 ) {
        return this.$message.error('删除权限失败！')
      }
      // this._getRoleList() 会使页面重新渲染，不好

      // 把服务器返回的数据重新复制给函数，使页面不会重新渲染
      role.children = res.data


      // var promise = new Promise(function(resolve) {
      //   if (confirmResult){
      //     resolve(confirmResult)
      //     console.log(confirmResult);
      //   }
      // })

      // promise.then((res) =>  {
      //   console.log(res)
      //   return this.$message.success('删除成功')
      // }).catch(() => {
      //   return this.$message.info('删除失败')
      // })
    },
    async showSetRightDialog(role) {
      this.roleId = role.id
      // 获取所有权限数据
      const {data: res} = await this.$http.get('/rights/tree')
      if(res.meta.status !== 200) {
        return this.$message.error('获取权限数据失败')
      }
      this.rightslist = res.data
      console.log(this.rightslist);
      
      // 递归获取三级节点的id
      this.getLeafKeys(role, this.defKeys)
      this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取角色下所有三级权限的id,并保存到defKey数组中
    getLeafKeys(node, arr) {
      if (!node.children) {
        return arr.push(node.id)
      }

      node.children.forEach(item => {
        this.getLeafKeys(item, arr)
      });
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed() {
      this.defKeys = []
    },
    async allotRights() {
        const keys = [
          ...this.$refs.treeRef.
          getCheckedKeys(),
          ...this.$refs.treeRef.
          getHalfCheckedKeys()
        ]

        const idStr = keys.join(',')
        const {data: res} = await this.$http.post(`/roles/${this.roleId}/rights`, {
          rids: idStr
        })

        if(res.meta.status !== 200) {
          return this.$message.error('分配权限失败')
        }
        this.$message.success('分配权限成功')
        this._getRoleList()
        this.setRightDialogVisible = false
    }
  }
}
</script>

<style lang="less" scoped>
  .set-button{
    padding: 5px;
  }
  .el-tag{
    margin: 7px;
  }
  .bdtop{
      border-top: 1px solid #eeeeee
  }
  .bdbottom{
      border-bottom: 1px solid #eeee
  }
  .vcenter{
    display: flex;
    align-items: center;
  }
</style>